Balancing equations & identifying reaction types

The correct coefficients to correctly balance the following equation

____ C₇H₁₆ + ____ O_{2 -->} ____ CO₂ + ____ H₂O

from left to right would be:

• 2, 22, 14, 16

• 1, 5, 3, 4

• 1, 15/2, 7, 8

• 1, 11, 7, 8

Which of the following reactions reactions would be classified as single replacement?

• ____ P₄ + ____ O₂ --> ____ P₂O₃

• ____ Al + ____ HCl --> ____ H₂ + ____ AlCl₃

• ____ SO₂ + ____ Li₂Se --> ____ SSe₂ + ____ Li₂O

• ____ K + ____ Cl₂ --> ____ KCl

What coefficient would go in from of hydrogen cyanide (HCN) in order for this chemical equation to be correctly balanced?

__ HCN + ___ CuSO₄ --> ___ H₂SO₄ + ___ Cu(CN)₂

• 4

• 3

• 2

• 1

Tags

NGSS.HS-PS1-7

Identify the double replacement reactions below?

• _ Na₃PO₄ + _ KOH --> _ NaOH + _ K₃PO₄

• _ AgNO₃ + _ CuCl₂ --> _ Cu(NO₃)₂ + _ AgCl(s)

• _ N₂ + _ H₂ --> _ NH₃

• _ Al + _ HCl --> _ H₂ + _ AlCl₃

Choose the combustion reaction that is correctly balanced.

• 1 C₂H₂ + 5 O₂ --> 2 CO₂ + 1 H₂O

• 1 C₂H₄ + 3 O₂ --> 2 CO₂ + 4 H₂O

• 2 C₂H₆ + 7 O₂ --> 2 CO₂ + 3 H₂O

• 1 CH₄ + 2O₂ --> CO₂ + 2 H₂O

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

What is happening in this reaction?

H₂CO₃(aq) --> H₂O(l) + CO₂(g)

• Carbonic acid, H₂CO₃ is being combusted.

• Carbonic acid, H₂CO₃ is being rearranged.

• Water and carbon dioxide are products of decomposition.

• Carbonic acid, H₂CO₃ is single replacement.

Tags

NGSS.HS-PS1-7

When a single reactant produces two or more products, we know a (a)   reaction has taken place.

For which reaction is an alkaline earth metal replacing an alkali metal?

• _GaF₃ + _ Cs -->_ CsF + _ Ga

• _AgNO₃ + _ Cu -->_Cu(NO₃)₂ +_ Ag

• _NaF + _ Br₂ -->_NaBr + _ F₂

• _ MgF₂ +_ Li₂CO₃ -->_ MgCO₃ + _ LiF

Octane or gasoline, C₈H₁₈ is a non-polar hydrocarbon that evaporates quickly due to its LDF intermoleuclar bonds. What is the whole number coefficient in front of oxygen that correctly balances this reaction?

_C₈H₁₈ + _O₂ --> _H₂O + _CO₂

• 17/2

• 17

• 25/2

• 25

Tags

NGSS.HS-PS1-7

Which statements are true for the following equation?

3Ba(OH)₂ + 2AlCl₃ → 2Al(OH)₃ + 3BaCl₂

_{I. The equation shows a synthesis reaction.}

_{II. The equation is unbalanced as written.}

_III. The equation shows a double replacement reaction.

• I only

• I and II only

• III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-7